Reducing-furnace.



no. 633,375. Patented sept. `24, |901.

C. BISHOP; Y REDUGING FURNACE.

(Application Bled Jan. B, 1901.)

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Patnted Sept. 24, |90I.

c. rsHuP. REDUCING FURNACE. (Application mea un. a, 1901.)

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""NITED STATES PATENT OFFICE.

CHARLES BISHOP, OF SAN FRANCISCO, CALIFORNIA.

REDUCmcUFURNACE.y

SPECIFICATION forming part of Letters Batent No. 683,375, datedSeptember 24, 1901.

Application led January 3, 1901. Serial No. 41,980. (No model.)

T0 a/ZZ whom it may concern/.-

Beit known that I, CHARLES BISHOP, a citizen of the United States, and aresident of San Francisco, in the county of San Francisco and State ofCalifornia, have invented a new and Improved Reducing-Furnace, of whichthe following is a full, clear, and exact description.

This invention relates to improvements in furnaces for reducing orsmelting metal-bearing ores; and the object is to provide a furnace ofthis character in which a great heat may be maintained to rapidlyseparate the metals from their ores.

I will describe a reducing-furnace embodying myinvention and then pointout the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a perspective view of a furnace embodying myinvention. Fig.2 is a vertical section thereof. Fig. 3 is a section on the line 3 3 ofFig. 2. Fig. 4 is a section on the line 4 4 of Fig. 2. Fig.V 5 is asection on the line 5 of Fig. 2. Fig. 6 is a section on the line 6 6 ofFig. 2, and Fig. 7 is a section on the line 7 7 of Fig. 2.

The furnace comprises an outer wall 10, of suitable masonry-such,for-instance, as brick or stone-and a lining 11, of fire-brick. Betweenthe fire-brick lining and the outer wall at the four sides and at thetop sand 12 is placed to prevent the cracking of the walls or lining bycontraction and expansion. Arranged at opposite sides are fire-boxes 13,in which grates 14 are arranged, and below the grates are the ash-pits15. The fire-boxes are provided each with a suitable door 16, while eachash-pit has a door 17. The side walls and the front and rear Walls ofthe lining are provided with fines 18, through which the products ofcombustion may pass and discharge through the uptake or chimney 19.

Arranged in the furnace are arched supporting-plates 20, upon which theore under treatment is designed to rest. These arched plates areprovided with openings, through which the metal separated from the oresmay pass. This metal falls into inclined runways 21, from which itdischarges into a settlingtank 22, arranged in the forward portion ofthe furnace. In the front wall. 0f the furnace and forward of thesettling-tank 22 is a bullion-pot 23, which communicates at the bottomwith the settlin g-tank through an opening 24, and the bullion may bedrawn out of the bullion-pot through an opening 25, this opening 25 ofcourse beingnormally closed by a` suitable plug. The slag floating onthe top of the metal in the crucible or settling-tank will dischargethrough an opening 26,leadin g from the top of the tank 22 and outthrough the front wall. The ore to be treated may be passed into thefurnace and onto the supporting-plates 20 through an opening 27 in theback Wall of the furnace or through an opening 28, leading into thechimney-flue. These openings 27 and 28 are provided with suitable doors29 30.

In operation any desired fuel may be used. The heat will pass upwardthrough the ore supported on the arched plates, and this intense heatwill reduce or melt the metal, which will ilow downward into thesettlingtank, the bullion or heavy metal discharging from the bottom ofsaid tank into the bullionpot, and the slag, which rises to the top,will be floated off through the opening or pipe 26. Over thesettling-tank 22 is an arch 31, of fire-brick or the like, which willhave a tendencyto force heat downward upon the metal in saidsettling-tank.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A reducing-furnace, having fire-boxes at itsopposite sides, a series of arched plates arranged in the furnace andrearward of the fire-boxes, the said plates being perforated, inclinedrunways below the plates, a settlingtank for receiving material from therunways, and a bullion-pot having connection with the tank,substantially as specified.

2. A reducing-furnace, having fire-boxes, a series of arched perforatedplates in the furnace rearward of the fire-boxes, a settlingtank forwardof the plates and below the plane of the plates, an arch over the tank,and a bullion-pot communicating with the tank, substantially asspecified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' CHARLES BISHOP. lVitnesses:

GEO. E. Onsrnv,i

D. J. HALLOBAN.

IOO

